To keep the contour map simple and easy to read, not every contour line is marked with its elevation reading.
#CONTOUR INTERVAL CALCULATOR HOW TO#
How to Calculate Contour Interval from Maps?Ī contour map consists of contour lines of a given geographical region. If the ground has large variation in levels, for instance, hills and ponds If a detailed map is to be prepared for execution work Select Low CI like 0.5m, 0.25m, 0.1m or lessįor small scale maps covering a wide area of varying terrainįor rough topographical map meant for initial assessment only The selection of the contour interval is decided by the survey leader before the start of the mapping process depending upon the ground factors. The commonly used contour interval is 20 feet for a 1:24,000 map scale.įactors Affecting the Selection of Contour Interval When the contour interval is not specified in the map, it can be calculated as explained in the following sections. In every map, on the right-hand bottom side, the contour interval is specified. Considering the size of the area to be mapped, contour intervals are assumed. Usually there are different contour intervals for the different maps.
Example Calculation of Contour Intervals:Ī contour interval in surveying is the vertical distance or the difference in the elevation between the two contour lines in a topographical map.How to Calculate Contour Interval from Maps?.
Factors Affecting the Selection of Contour Interval.
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